论文部分内容阅读
对局部有挺水植被明渠均匀流,采用分区模型,合理计入区间界面的表观切应力,建立动力平衡方程,推导出各区的断面平均纵向流速公式.基于唯象模型得出了植被区和非植被区交界面上的表观切应力,该应力是由界面上引起动量交换且占主导地位的漩涡产生的.用动量差表征表观切应力,其动量交换系数与占主导地位的漩涡半径和断面水力半径之比的1/3次方成正比.最后将计算结果与实测值进行比较,两者符合良好,表明本文模型可有效用于局部有挺水植被明渠均匀流的水流计算.
The uniform flow of emergent channel with emergent water in partial area is adopted, the partition model is adopted, the apparent shear stress is reasonably included in the interval interface, the dynamic balance equation is established, and the formula of average longitudinal velocity in each section is deduced. Based on the phenomenological model, Apparent shear stress at the interface of non-vegetation area, which is generated by the vortex that causes momentum exchange and dominance at the interface, indicates the apparent shear stress by the difference of momentum, and its momentum exchange coefficient is proportional to the predominant vortex radius Which is proportional to the 1/3 of the ratio of the hydraulic radius of the section.Finally, the calculated results are compared with the measured values, which shows that the model can be effectively used to calculate the flow of uniform flow in open channels with emergent vegetation.